Required:
Minimum 80 MB disk space
MySQL 4.1.0 or later OR Microsoft SQL Server 2005 or later OR Postgres 8.1 or later
PHP 5.1.6 or later with the following modules/libraries enabled:
mbstring (Multibyte String Functions) extension library (see also Installation FAQ)
PDO database driver for MySQL (pdo_mysql or pdo_mysqli) or Postgres (pdo_pgsql) or MSSQL (pdo_sqlsrv)
For PHP versions <5.2 you will need to have the PECL JSON library( see pecl.php.net/package/json) installed
Also we assume in general that all PHP default libraries are enabled (like hash, session, etc.).